Pen



FIG. 1 is a front elevational view of a pen showing our new design in the form of a ball-point pen with the writing tip retracted;

FIG. 2 is a right side elevational view of FIG. 1, the left side being a mirror image thereof;

FIG. 3 is a bottom plan view of FIG. 1;

FIG. 4 is a top plan view of FIG. 1;

FIG. 5 is a front elevational view of a second embodiment of our new design in the form of a fountain pen;

FIG. 6 is a right side elevational view of FIG. 5, the left side being a mirror image thereof;

FIG. 7 is a bottom plan view of FIG. 5; and,

FIG. 8 is a top plan view of FIG. 5. 

The ornamental design for a pen, as shown and described. 